I went with Steins;Gate
I've seen Angel Beats and thought it was pretty good.
I've seen SAO 1 and wasn't a fan, but I will start SAO 2 Gun Gale Online soon
I'm watching No Game No Life and I do like it so far.
I've seen some of One Piece. I just can't get into long running Shounen( though I do really like Hunter X Hunter)
I just went with Steins;Gate maybe on biased reasons, but from all that I have seen it is my second favorite series( Shiki being first).